# 961 — Fastener standard equivalences: DIN to ISO / EN crossover

For 961, fastener description is M 8×1 to M 100×4 hexagon head bolts with fine pitch thread; iso equivalent is 8676; interchangeability is Nominal size extended; width across flats according to DIN ISO 272 included; modification notes is Nominal size extended; width across flats according to DIN ISO 272 included, recorded from its source on 2026-08-12.

- **DIN standard:** 961 _(verified: appears in the quote below)_
- **Fastener description:** M 8×1 to M 100×4 hexagon head bolts with fine pitch thread
- **ISO equivalent:** 8676 _(verified: appears in the quote below)_
- **Interchangeability:** Nominal size extended; width across flats according to DIN ISO 272 included _(verified: appears in the quote below)_
- **Modification notes:** Nominal size extended; width across flats according to DIN ISO 272 included _(verified: appears in the quote below)_

## What the source says

> 961 | 8676 | 28676 | 8676 | 8676 | 2001-03 | Hexagon head screws with metric fine pitch thread – Product grades A and B | Nominal size extended; width across flats according to DIN ISO 272 included |

## Sources disagree

More than one authority states this, and they do not state the same
thing. Both are reproduced with the source each came from.

### Fastener description

fullerfasteners.com says fastener description is **M 8×1 to M 100×4 hexagon head bolts with fine pitch thread**, as of 2026-08-12.

> 961 | 8676 | 28676 | 8676 | 8676 | 2001-03 | Hexagon head screws with metric fine pitch thread – Product grades A and B | Nominal size extended; width across flats according to DIN ISO 272 included |

Source: https://fullerfasteners.com/tech/din-iso-en-crossover-chart/

monsterbolts.com says fastener description is **Fine thread FT.**, as of 2026-08-12.

> DIN 961 | ISO 8676 | Fully interchangeable

Source: https://monsterbolts.com/pages/common-din-numbers-for-metric-fasteners

trfastenings.com says fastener description is **M8x1 to M52x3 Hexagon Head Bolts with fine pitch thread - product grades A and B**, as of 2026-08-12.

> DIN 961 | ISO 8676 | | M8x1 to M52x3 Hexagon Head Bolts with fine pitch thread - product grades A and B |

Source: https://www.trfastenings.com/knowledge-base/engineering-data/fastener-standards


### Interchangeability

fullerfasteners.com says interchangeability is **Nominal size extended; width across flats according to DIN ISO 272 included**, as of 2026-08-12.

> 961 | 8676 | 28676 | 8676 | 8676 | 2001-03 | Hexagon head screws with metric fine pitch thread – Product grades A and B | Nominal size extended; width across flats according to DIN ISO 272 included |

Source: https://fullerfasteners.com/tech/din-iso-en-crossover-chart/

monsterbolts.com says interchangeability is **Fully interchangeable**, as of 2026-08-12.

> DIN 961 | ISO 8676 | Fully interchangeable

Source: https://monsterbolts.com/pages/common-din-numbers-for-metric-fasteners


## Source

- https://fullerfasteners.com/tech/din-iso-en-crossover-chart/
- https://monsterbolts.com/pages/common-din-numbers-for-metric-fasteners
- https://www.trfastenings.com/knowledge-base/engineering-data/fastener-standards

Last verified: 2026-08-12. Review by: 2028-08-11.
Part of [Fastener standard equivalences: DIN to ISO / EN crossover](https://referencesource.org/fastener-thread-standard-equivalence/).